To measure the bone density at the basal bone level, another section is selected at 2 to 5 mm above the root apex of the premolars and molars.
The cancellous bone in the mandible had densities between 456 and 492 HU at the alveolar bone and 453 and 518 HU at the basal bone.
For the mandible, cortical bone density values were between 1,267 and 1,734 HU at the alveolar bone and between 1,588 and 1,728 HU at the basal bone.
Three jaw bones is the basal state.
The highest cortical bone density was observed between the second premolar and first molar at the alveolar bone level and between the first and second molars at the basal bone level in the maxilla.
When the mean values (right and left) were calculated for each area, the overall bone density was approximately between 1,020 and 1,520 HU for the maxillary alveolar cortical bone except for the maxillary tuberosity (888 HU in the buccal and 970 HU in the palatal cortical bone), and between 1,266 and 1,546 HU at the basal cortical bone except for the tuberosity (970 HU).
The primary aim of this device is to provide a lateral expansion force of such an intensity as to verify the movement of the basal maxillary bones at the suture level (median palatal, maxillary-zygomatic and pterigo-maxillary sutures) instead of a simple re-modelling of the alveolar arch.
Usually, there is a severe lack of alveolar bone width and often height and bone has never been there, since alveolar bone is unlike the basal jaw bone, a development of the erupting tooth.
At the basal cortical bone, the area between the first and second molars (6-7) showed the highest bone density, followed by the area between the second premolar and first molar (5-6).
At the basal cortical bone level, the interradicular area between the first and second molars showed the highest bone density followed by the area betweenthe second premolar and first molar.
